By Paul Ziobro and Joann S. Lublin 

A prominent proxy adviser urged the ouster of most Target Corp. board members for failing to manage risks and protect the company from a massive data breach at the end of last year, a warning to corporate boardrooms to take cybersecurity more seriously.

Institutional Shareholder Services, which advises big shareholders how to vote on corporate ballots, called on Target shareholders to oust seven of the company's 10 directors for not doing enough to ensure Target's systems were fortified against security threats.

The recommendation focused on directors who serve on Target's audit and corporate-responsibility committees, which are tasked with overseeing and managing risk. "It appears that failure of the committees to ensure appropriate management of these risks set the stage for the data breach, which has resulted in significant losses to the company and its shareholders," ISS wrote.

The report puts corporate board members on notice to treat the risks associated with cyberattacks more seriously, particularly directors at retailers which store vast amounts of data like credit card numbers and personal information that cybercriminals seek. Other retailers like Michaels Stores Inc. and Neiman Marcus Group have fallen victim to cyberattacks where credit-card information was compromised.

The ISS move is "raising a red flag about risk oversight that is a growing issue for boards," said Eleanor Bloxham, a corporate governance consultant in Columbus, Ohio.

Many corporate directors have begun paying greater attention to overseeing risk--such as through the appointment of a chief audit executive who reports directly to the full board, an arrangement that allows the board to get unfiltered information.

Kenneth Daly, president of the National Association of Corporate Directors, estimates that several hundred U.S. companies now employ a chief audit executive who reports directly to the board. "Five years ago, it was uncommon," Mr. Daly said.

In response to ISS's criticism Wednesday, Target's board said overseeing risk is the responsibility of the entire board and is part of its continuing review of the company's strategy. It said that Target's security measures were "among the best-in-class within the retail industry," adding that it had made significant investments in data security and that its payment systems had been compliant with industry guidelines.

Hackers worked their way into Target's payment network in mid-November, using the credentials of a third-party refrigeration contractor to access the retailers system. The malware worked for roughly three weeks, scooping up valuable data compromising 40 million credit- and debit-card numbers eventually sold on the black market.

Another proxy advisory firm, Glass, Lewis & Co., took a different stance, saying there wasn't yet enough evidence that the data breach was due to any neglect by Target's board or executives.

ISS, which rarely recommends voting against a majority of the board, added that actions Target took in response to the breach, like replacing the chief information officer and beefing up its security protocols, appear "largely reactionary" and could have prevented the data breach had the company implemented them sooner.

ISS called for voting against Target's two longest-serving directors: former Xerox Corp. Chief Executive Anne Mulcahy and the one-time head of Fannie Mae and lead independent director James Johnson. Roxanne Austin, the interim chairman, is another director ISS targeted for defeat.

The firm recommends voting for Kenneth Salazar, the former U.S. senator who leads the corporate responsibility committee and joined the board last July, as well as two members who didn't serve on the audit or oversight committees.

The shareholder votes will be counted at Target's annual meeting, scheduled for June 11.

Write to Paul Ziobro at Paul.Ziobro@wsj.com and Joann S. Lublin at joann.lublin@wsj.com

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